Patch for the core file is attached.
Cheers, Henri
diff --git a/tex/context/base/mkiv/spac-hor.mkiv b/tex/context/base/mkiv/spac-hor.mkiv
index 32b7f06fb..24c7c7893 100644
--- a/tex/context/base/mkiv/spac-hor.mkiv
+++ b/tex/context/base/mkiv/spac-hor.mkiv
@@ -717,7 +717,7 @@
\global\s_spac_narrower_left \zeropoint
\global\s_spac_narrower_right \zeropoint
\global\s_spac_narrower_middle\zeropoint
- \edef\askednarrower{#1}
+ \edef\askednarrower{#1}%
\ifx\askednarrower\v!reverse
\ifconditional\s_spac_narrower_last_swap
\leftskip \s_spac_narrower_right_last
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